Typewriting machine



Dec. 11,1928. 1 1,694,923

A. G. F.'KUROW$KI TYPEWRI TI NG MACHINE Filed May 4, 1927 W mi/emorz yAf/or y,

Patented Dec. 11, 1 928.

UNITED STATES PATENT OFFICE...

ALFRED G. F. ,KUROWSKI, or BROOKLYN, NEW YORK, AssIsNon'To nnnnnwoonELLIOTT FISHER COMPANY, or new YORK, n. Y., A conronnrron or DELAWARE.

TYPE'WRITING MACHINE.

Application filed. May 4.,

My invention relates to type-cleaning attachments for typewritingmachines.

To clean the. types, the operator uses a detachably fastened to a fixedpart of a frontstrike .typewriting machine and be used without soilingthe operatives hands.

A further feature'is the provision of a device for cleaning the typewhen the front of the typewriter is closed, such as in the case where anadding machine is attached to the typewriter. In carrying out myinvention,

a clamp-carrying bracket is detachablyfastened to the type-guide of anUnderwood typewriting machine anda suitable brush 1s clamped in saidbracketin posltion to be struck by thet-ypes when the keys of the machine are depressed in the usual way.

A further feature of my invention is the provision of means foradjustably mounting a cleaning brush so that, as parts of the brushbecome worn, the brush may be adjusted on its support to present anunused portion for engagement with the type.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a fragmentary side View, shown partly in section, of anUnderwood typewriting machine, having my invention attached thereto.

Figure 2 is a cross-sectional view, front to rear, of a brush-holdingbracket employed in carrying out my invention.

Figure 3 is a bottom View of the bracket shown in Figure 2. I

Figure 4 is a perspective view of the bracle et shown in Figure 2,illustrating how a typecleaning brush is held therein.

In an Underwood typewriting machine, it is usual to pivot a key-lever 10on a fulcrumrod 11, supported on the main frame (not shown), and toreturn the key-lever by a spring 12 to normal position after operation.A bell-crank 13 transmits motion of the keylever 10 to the type-bar 14,pivoted about a fulcrum-rod 15, fixed on a stationary typesegment 16,which is fastened to the main frame. The type-bar is swung upwardly tostrike through a ribbon 17 vibrated by mechanism (not shown), against aplaten 18 each time a key 20 on the key-lever 10 is depressed.

1927. Serial'No. 188,643.

Atype-guide 21, having: two forwardly-proectm g wings 22 at its top, isfastened rigidly to the segment 16, as usual in an Underwoodtypewriting' machine. A brush-holding bracket, generally designated. as23, has two integral side elements 24 formed of sheetmetal to engageclosely about the sides of the type-guide 21 and extend forwardlytherefrom. The forward portions of the elements 24 are bent inwardly toform a U-shaped flange 25 having clamping ends 26 arranged for fittingclosely'in lengthwise grooves 27 of a type-cleaning; brush, generallydesignatedas 28. I I s For helping to hold the bracket 23 securely onthe type-guide 21, especially against rearward movement, a horizontalpocket 29 1s formed ad acent the top of the bracket by bending a strip30, which is integral with the side elements 2.4, downwardly andrearwardly in such way that the pocket formed thereby will fit closelyagainst the wings 22 on the front and lower sides thereof, as shown inFigure 1. For detachably fastening the- ,bracket 23 in place on thetype-guide 21, a spring-latch 31 is fastened to the front wall of thepocket 29 and extends rearwardly therefrom and terminates in a tab ordetentmember 32 arranged to snap down behind the top of the type-guide21. An operator may release the latch 31 and remove the typecleaningattachment by simply pressing upwardly on the tab 32, and pullingforwardly and upwardly on thebrush 28.

To use my type-cleaning attachment, it is only necessary for theoperative to depress the key 20 and swing the type-bar 14 up tothedotted-line position of the latter, as shown in Figure 1. I

To provide for bringing unused portions of bristles 33 of the brush 28to position to be engaged by a type-head 34, when its type bar 14 isswung upwardly, a thumb-screw 35 may extend from one side through thebracket 23, as shown in Figure 3, to have its threaded end engage in athreaded hole 36 in the side element 24 on the opposite side of thebracket. After loosening the screw 35 in the usual way, a new portion ofthe bristles can be slid along the ends 26 to type-engaging position,and the screw 35 tightened up again to bind the brush by the clamps 25.It will be noted that the bracket side elements 24 are pressed againstthe sides of the type-guide upon making the screw 35 tight in thebracket 23, thereby helping to hold the latter securely on thetypeguide.

It will be noted that by having the clamps 25 inclined forwardly at thetop, as shown in Figure 1, the portion of the bristles which engages thetype-head 34 at any time is always positioned so that particles of grit,etc., dislodged from the type-head will fall by gravity clear of anyportion of the bristles below the point of contact with the type-head,and also clear of the fulcrum-rod of the typebar 14.

Variations may be resorted to within the scope of the invention, andportions of the improvements may be used without others.

Having thus described my invention, I claim: a

I 1. In a typecleaning attachment for a typewriting machine having atype-guide, a brackethavin-g side elements engaging against the sides ofsaid type-guide, extensions on said side elements formed into clamps, atypecleaning brush having grooves to receive said clamps for mountingthe brush on the bracket, and means including a spring-pressed detentengaging behind said type-guide for fastening said bracket on'saidtype-guide.

2. In a type cleaning attachment foal a type-writing machine, a brackethaving sides with extensions formed into U-shaped clamps,

a type-cleaning brush having longitudinallyextending grooves in whichthe clamps engage, said grooved brush being slidable along said clampsfor adjustably mounting said brush on said bracket, releasable means forpressing said clamps against said brush, and means for mounting saidbracket on said machine.

3. In a type-cleaning attachment for a typewriting machine, a brackethaving side extensions formed into U-shaped clamps, a type-cleaningbrush having longitudinallyextending grooves in which the clamps engage,said grooved brush being slidable along said clamps for adjustablymounting the brush on the bracket, and a thumb-screw passing throughapertures in the sides for releasing and tightening the clamps to holdthe brush in different operative positions.

4. In a front-strike typewriting machine,

the combination with key-operated types and a type-guide havingforwardly-extending wings, of a type-cleaning attachment including abracket supported on said guide, a brush fastened in said bracket andpositioned for having said types strike thereagainst, arearwardly-opening pocket on said bracket engaging about said Wings andefiective for preventing backward movement of said attachment by theblows of said types, and a springprcssed latch engaging behind saidtypeguide for detachably securing said bracket on said typeguide.

ALFRED G. F. KUROWSKI.

